linux-kernel - [PATCH -next] riscv: perf: RISCV_BASE

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Message-ID: <20200507150445.174390-2-wangkefeng.wang@huawei.com>
Date:   Thu, 7 May 2020 23:04:45 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>
CC:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Alan Kao <alankao@...estech.com>
Subject: [PATCH -next] riscv: perf: RISCV_BASE_PMU should be closeable

As 178e9fc47aae("perf: riscv: preliminary RISC-V support") said,
For RISCV_BASE_PMU, 'this option can also be disable to reduce kernel size',
but it could not work well, we need diable both RISCV_BASE_PMU and
PERF_EVENTS manually, or build error will occur when only disable
RISCV_BASE_PMU.

Cc: Alan Kao <alankao@...estech.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 arch/riscv/include/asm/perf_event.h | 8 ++------
 arch/riscv/kernel/Makefile          | 2 +-
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/riscv/include/asm/perf_event.h b/arch/riscv/include/asm/perf_event.h
index 0234048b12bc..062efd3a1d5d 100644
--- a/arch/riscv/include/asm/perf_event.h
+++ b/arch/riscv/include/asm/perf_event.h
@@ -12,19 +12,14 @@
 #include <linux/ptrace.h>
 #include <linux/interrupt.h>
 
+#ifdef CONFIG_RISCV_BASE_PMU
 #define RISCV_BASE_COUNTERS	2
 
 /*
  * The RISCV_MAX_COUNTERS parameter should be specified.
  */
 
-#ifdef CONFIG_RISCV_BASE_PMU
 #define RISCV_MAX_COUNTERS	2
-#endif
-
-#ifndef RISCV_MAX_COUNTERS
-#error "Please provide a valid RISCV_MAX_COUNTERS for the PMU."
-#endif
 
 /*
  * These are the indexes of bits in counteren register *minus* 1,
@@ -82,6 +77,7 @@ struct riscv_pmu {
 	int		irq;
 };
 
+#endif
 #ifdef CONFIG_PERF_EVENTS
 #define perf_arch_bpf_user_pt_regs(regs) (struct user_regs_struct *)regs
 #endif
diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index 1f5736e996fd..b355cf485671 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -43,7 +43,7 @@ obj-$(CONFIG_MODULE_SECTIONS)	+= module-sections.o
 obj-$(CONFIG_FUNCTION_TRACER)	+= mcount.o ftrace.o
 obj-$(CONFIG_DYNAMIC_FTRACE)	+= mcount-dyn.o
 
-obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o
+obj-$(CONFIG_RISCV_BASE_PMU)	+= perf_event.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_callchain.o
 obj-$(CONFIG_HAVE_PERF_REGS)	+= perf_regs.o
 obj-$(CONFIG_RISCV_SBI)		+= sbi.o
-- 
2.26.2